2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/module.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
39 #include <asm/processor.h>
42 #include <asm/kdump.h>
44 #include <asm/system.h>
46 #include <asm/pgtable.h>
48 #include <asm/iommu.h>
49 #include <asm/btext.h>
50 #include <asm/sections.h>
51 #include <asm/machdep.h>
52 #include <asm/pSeries_reconfig.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/kexec.h>
57 #define DBG(fmt...) printk(KERN_ERR fmt)
63 static int __initdata dt_root_addr_cells
;
64 static int __initdata dt_root_size_cells
;
67 int __initdata iommu_is_off
;
68 int __initdata iommu_force_on
;
69 unsigned long tce_alloc_start
, tce_alloc_end
;
75 static struct boot_param_header
*initial_boot_params __initdata
;
77 struct boot_param_header
*initial_boot_params
;
80 static struct device_node
*allnodes
= NULL
;
82 /* use when traversing tree through the allnext, child, sibling,
83 * or parent members of struct device_node.
85 static DEFINE_RWLOCK(devtree_lock
);
87 /* export that to outside world */
88 struct device_node
*of_chosen
;
90 static inline char *find_flat_dt_string(u32 offset
)
92 return ((char *)initial_boot_params
) +
93 initial_boot_params
->off_dt_strings
+ offset
;
97 * This function is used to scan the flattened device-tree, it is
98 * used to extract the memory informations at boot before we can
101 int __init
of_scan_flat_dt(int (*it
)(unsigned long node
,
102 const char *uname
, int depth
,
106 unsigned long p
= ((unsigned long)initial_boot_params
) +
107 initial_boot_params
->off_dt_struct
;
112 u32 tag
= *((u32
*)p
);
116 if (tag
== OF_DT_END_NODE
) {
120 if (tag
== OF_DT_NOP
)
122 if (tag
== OF_DT_END
)
124 if (tag
== OF_DT_PROP
) {
125 u32 sz
= *((u32
*)p
);
127 if (initial_boot_params
->version
< 0x10)
128 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
133 if (tag
!= OF_DT_BEGIN_NODE
) {
134 printk(KERN_WARNING
"Invalid tag %x scanning flattened"
135 " device tree !\n", tag
);
140 p
= _ALIGN(p
+ strlen(pathp
) + 1, 4);
141 if ((*pathp
) == '/') {
143 for (lp
= NULL
, np
= pathp
; *np
; np
++)
149 rc
= it(p
, pathp
, depth
, data
);
157 unsigned long __init
of_get_flat_dt_root(void)
159 unsigned long p
= ((unsigned long)initial_boot_params
) +
160 initial_boot_params
->off_dt_struct
;
162 while(*((u32
*)p
) == OF_DT_NOP
)
164 BUG_ON (*((u32
*)p
) != OF_DT_BEGIN_NODE
);
166 return _ALIGN(p
+ strlen((char *)p
) + 1, 4);
170 * This function can be used within scan_flattened_dt callback to get
171 * access to properties
173 void* __init
of_get_flat_dt_prop(unsigned long node
, const char *name
,
176 unsigned long p
= node
;
179 u32 tag
= *((u32
*)p
);
184 if (tag
== OF_DT_NOP
)
186 if (tag
!= OF_DT_PROP
)
190 noff
= *((u32
*)(p
+ 4));
192 if (initial_boot_params
->version
< 0x10)
193 p
= _ALIGN(p
, sz
>= 8 ? 8 : 4);
195 nstr
= find_flat_dt_string(noff
);
197 printk(KERN_WARNING
"Can't find property index"
201 if (strcmp(name
, nstr
) == 0) {
211 int __init
of_flat_dt_is_compatible(unsigned long node
, const char *compat
)
214 unsigned long cplen
, l
;
216 cp
= of_get_flat_dt_prop(node
, "compatible", &cplen
);
220 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
230 static void *__init
unflatten_dt_alloc(unsigned long *mem
, unsigned long size
,
235 *mem
= _ALIGN(*mem
, align
);
242 static unsigned long __init
unflatten_dt_node(unsigned long mem
,
244 struct device_node
*dad
,
245 struct device_node
***allnextpp
,
246 unsigned long fpsize
)
248 struct device_node
*np
;
249 struct property
*pp
, **prev_pp
= NULL
;
252 unsigned int l
, allocl
;
256 tag
= *((u32
*)(*p
));
257 if (tag
!= OF_DT_BEGIN_NODE
) {
258 printk("Weird tag at start of node: %x\n", tag
);
263 l
= allocl
= strlen(pathp
) + 1;
264 *p
= _ALIGN(*p
+ l
, 4);
266 /* version 0x10 has a more compact unit name here instead of the full
267 * path. we accumulate the full path size using "fpsize", we'll rebuild
268 * it later. We detect this because the first character of the name is
271 if ((*pathp
) != '/') {
274 /* root node: special case. fpsize accounts for path
275 * plus terminating zero. root node only has '/', so
276 * fpsize should be 2, but we want to avoid the first
277 * level nodes to have two '/' so we use fpsize 1 here
282 /* account for '/' and path size minus terminal 0
291 np
= unflatten_dt_alloc(&mem
, sizeof(struct device_node
) + allocl
,
292 __alignof__(struct device_node
));
294 memset(np
, 0, sizeof(*np
));
295 np
->full_name
= ((char*)np
) + sizeof(struct device_node
);
297 char *p
= np
->full_name
;
298 /* rebuild full path for new format */
299 if (dad
&& dad
->parent
) {
300 strcpy(p
, dad
->full_name
);
302 if ((strlen(p
) + l
+ 1) != allocl
) {
303 DBG("%s: p: %d, l: %d, a: %d\n",
304 pathp
, (int)strlen(p
), l
, allocl
);
312 memcpy(np
->full_name
, pathp
, l
);
313 prev_pp
= &np
->properties
;
315 *allnextpp
= &np
->allnext
;
318 /* we temporarily use the next field as `last_child'*/
322 dad
->next
->sibling
= np
;
325 kref_init(&np
->kref
);
331 tag
= *((u32
*)(*p
));
332 if (tag
== OF_DT_NOP
) {
336 if (tag
!= OF_DT_PROP
)
340 noff
= *((u32
*)((*p
) + 4));
342 if (initial_boot_params
->version
< 0x10)
343 *p
= _ALIGN(*p
, sz
>= 8 ? 8 : 4);
345 pname
= find_flat_dt_string(noff
);
347 printk("Can't find property name in list !\n");
350 if (strcmp(pname
, "name") == 0)
352 l
= strlen(pname
) + 1;
353 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
),
354 __alignof__(struct property
));
356 if (strcmp(pname
, "linux,phandle") == 0) {
357 np
->node
= *((u32
*)*p
);
358 if (np
->linux_phandle
== 0)
359 np
->linux_phandle
= np
->node
;
361 if (strcmp(pname
, "ibm,phandle") == 0)
362 np
->linux_phandle
= *((u32
*)*p
);
365 pp
->value
= (void *)*p
;
369 *p
= _ALIGN((*p
) + sz
, 4);
371 /* with version 0x10 we may not have the name property, recreate
372 * it here from the unit name if absent
375 char *p
= pathp
, *ps
= pathp
, *pa
= NULL
;
388 pp
= unflatten_dt_alloc(&mem
, sizeof(struct property
) + sz
,
389 __alignof__(struct property
));
396 memcpy(pp
->value
, ps
, sz
- 1);
397 ((char *)pp
->value
)[sz
- 1] = 0;
398 DBG("fixed up name for %s -> %s\n", pathp
,
404 np
->name
= of_get_property(np
, "name", NULL
);
405 np
->type
= of_get_property(np
, "device_type", NULL
);
412 while (tag
== OF_DT_BEGIN_NODE
) {
413 mem
= unflatten_dt_node(mem
, p
, np
, allnextpp
, fpsize
);
414 tag
= *((u32
*)(*p
));
416 if (tag
!= OF_DT_END_NODE
) {
417 printk("Weird tag at end of node: %x\n", tag
);
424 static int __init
early_parse_mem(char *p
)
429 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
430 DBG("memory limit = 0x%lx\n", memory_limit
);
434 early_param("mem", early_parse_mem
);
437 * The device tree may be allocated below our memory limit, or inside the
438 * crash kernel region for kdump. If so, move it out now.
440 static void move_device_tree(void)
442 unsigned long start
, size
;
445 DBG("-> move_device_tree\n");
447 start
= __pa(initial_boot_params
);
448 size
= initial_boot_params
->totalsize
;
450 if ((memory_limit
&& (start
+ size
) > memory_limit
) ||
451 overlaps_crashkernel(start
, size
)) {
452 p
= __va(lmb_alloc_base(size
, PAGE_SIZE
, lmb
.rmo_size
));
453 memcpy(p
, initial_boot_params
, size
);
454 initial_boot_params
= (struct boot_param_header
*)p
;
455 DBG("Moved device tree to 0x%p\n", p
);
458 DBG("<- move_device_tree\n");
462 * unflattens the device-tree passed by the firmware, creating the
463 * tree of struct device_node. It also fills the "name" and "type"
464 * pointers of the nodes so the normal device-tree walking functions
465 * can be used (this used to be done by finish_device_tree)
467 void __init
unflatten_device_tree(void)
469 unsigned long start
, mem
, size
;
470 struct device_node
**allnextp
= &allnodes
;
472 DBG(" -> unflatten_device_tree()\n");
474 /* First pass, scan for size */
475 start
= ((unsigned long)initial_boot_params
) +
476 initial_boot_params
->off_dt_struct
;
477 size
= unflatten_dt_node(0, &start
, NULL
, NULL
, 0);
478 size
= (size
| 3) + 1;
480 DBG(" size is %lx, allocating...\n", size
);
482 /* Allocate memory for the expanded device tree */
483 mem
= lmb_alloc(size
+ 4, __alignof__(struct device_node
));
484 mem
= (unsigned long) __va(mem
);
486 ((u32
*)mem
)[size
/ 4] = 0xdeadbeef;
488 DBG(" unflattening %lx...\n", mem
);
490 /* Second pass, do actual unflattening */
491 start
= ((unsigned long)initial_boot_params
) +
492 initial_boot_params
->off_dt_struct
;
493 unflatten_dt_node(mem
, &start
, NULL
, &allnextp
, 0);
494 if (*((u32
*)start
) != OF_DT_END
)
495 printk(KERN_WARNING
"Weird tag at end of tree: %08x\n", *((u32
*)start
));
496 if (((u32
*)mem
)[size
/ 4] != 0xdeadbeef)
497 printk(KERN_WARNING
"End of tree marker overwritten: %08x\n",
498 ((u32
*)mem
)[size
/ 4] );
501 /* Get pointer to OF "/chosen" node for use everywhere */
502 of_chosen
= of_find_node_by_path("/chosen");
503 if (of_chosen
== NULL
)
504 of_chosen
= of_find_node_by_path("/chosen@0");
506 DBG(" <- unflatten_device_tree()\n");
510 * ibm,pa-features is a per-cpu property that contains a string of
511 * attribute descriptors, each of which has a 2 byte header plus up
512 * to 254 bytes worth of processor attribute bits. First header
513 * byte specifies the number of bytes following the header.
514 * Second header byte is an "attribute-specifier" type, of which
515 * zero is the only currently-defined value.
516 * Implementation: Pass in the byte and bit offset for the feature
517 * that we are interested in. The function will return -1 if the
518 * pa-features property is missing, or a 1/0 to indicate if the feature
519 * is supported/not supported. Note that the bit numbers are
520 * big-endian to match the definition in PAPR.
522 static struct ibm_pa_feature
{
523 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
524 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
525 unsigned char pabyte
; /* byte number in ibm,pa-features */
526 unsigned char pabit
; /* bit number (big-endian) */
527 unsigned char invert
; /* if 1, pa bit set => clear feature */
528 } ibm_pa_features
[] __initdata
= {
529 {0, PPC_FEATURE_HAS_MMU
, 0, 0, 0},
530 {0, PPC_FEATURE_HAS_FPU
, 0, 1, 0},
531 {CPU_FTR_SLB
, 0, 0, 2, 0},
532 {CPU_FTR_CTRL
, 0, 0, 3, 0},
533 {CPU_FTR_NOEXECUTE
, 0, 0, 6, 0},
534 {CPU_FTR_NODSISRALIGN
, 0, 1, 1, 1},
536 /* put this back once we know how to test if firmware does 64k IO */
537 {CPU_FTR_CI_LARGE_PAGE
, 0, 1, 2, 0},
539 {CPU_FTR_REAL_LE
, PPC_FEATURE_TRUE_LE
, 5, 0, 0},
542 static void __init
scan_features(unsigned long node
, unsigned char *ftrs
,
543 unsigned long tablelen
,
544 struct ibm_pa_feature
*fp
,
545 unsigned long ft_size
)
547 unsigned long i
, len
, bit
;
549 /* find descriptor with type == 0 */
555 return; /* descriptor 0 not found */
562 /* loop over bits we know about */
563 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
564 if (fp
->pabyte
>= ftrs
[0])
566 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
567 if (bit
^ fp
->invert
) {
568 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
569 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
571 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
572 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
577 static void __init
check_cpu_pa_features(unsigned long node
)
579 unsigned char *pa_ftrs
;
580 unsigned long tablelen
;
582 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
586 scan_features(node
, pa_ftrs
, tablelen
,
587 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
590 static struct feature_property
{
593 unsigned long cpu_feature
;
594 unsigned long cpu_user_ftr
;
595 } feature_properties
[] __initdata
= {
596 #ifdef CONFIG_ALTIVEC
597 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
598 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
599 #endif /* CONFIG_ALTIVEC */
601 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
602 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
603 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
604 #endif /* CONFIG_PPC64 */
607 static void __init
check_cpu_feature_properties(unsigned long node
)
610 struct feature_property
*fp
= feature_properties
;
613 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
614 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
615 if (prop
&& *prop
>= fp
->min_value
) {
616 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
617 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
622 static int __init
early_init_dt_scan_cpus(unsigned long node
,
623 const char *uname
, int depth
,
626 static int logical_cpuid
= 0;
627 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
634 /* We are scanning "cpu" nodes only */
635 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
638 /* Get physical cpuid */
639 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
641 nthreads
= len
/ sizeof(int);
643 intserv
= of_get_flat_dt_prop(node
, "reg", NULL
);
648 * Now see if any of these threads match our boot cpu.
649 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
651 for (i
= 0; i
< nthreads
; i
++) {
653 * version 2 of the kexec param format adds the phys cpuid of
656 if (initial_boot_params
&& initial_boot_params
->version
>= 2) {
658 initial_boot_params
->boot_cpuid_phys
) {
664 * Check if it's the boot-cpu, set it's hw index now,
665 * unfortunately this format did not support booting
666 * off secondary threads.
668 if (of_get_flat_dt_prop(node
,
669 "linux,boot-cpu", NULL
) != NULL
) {
676 /* logical cpu id is always 0 on UP kernels */
682 DBG("boot cpu: logical %d physical %d\n", logical_cpuid
,
684 boot_cpuid
= logical_cpuid
;
685 set_hard_smp_processor_id(boot_cpuid
, intserv
[i
]);
688 * PAPR defines "logical" PVR values for cpus that
689 * meet various levels of the architecture:
690 * 0x0f000001 Architecture version 2.04
691 * 0x0f000002 Architecture version 2.05
692 * If the cpu-version property in the cpu node contains
693 * such a value, we call identify_cpu again with the
694 * logical PVR value in order to use the cpu feature
695 * bits appropriate for the architecture level.
697 * A POWER6 partition in "POWER6 architected" mode
698 * uses the 0x0f000002 PVR value; in POWER5+ mode
699 * it uses 0x0f000001.
701 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
702 if (prop
&& (*prop
& 0xff000000) == 0x0f000000)
703 identify_cpu(0, *prop
);
706 check_cpu_feature_properties(node
);
707 check_cpu_pa_features(node
);
709 #ifdef CONFIG_PPC_PSERIES
711 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
713 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
719 #ifdef CONFIG_BLK_DEV_INITRD
720 static void __init
early_init_dt_check_for_initrd(unsigned long node
)
725 DBG("Looking for initrd properties... ");
727 prop
= of_get_flat_dt_prop(node
, "linux,initrd-start", &l
);
729 initrd_start
= (unsigned long)__va(of_read_ulong(prop
, l
/4));
731 prop
= of_get_flat_dt_prop(node
, "linux,initrd-end", &l
);
733 initrd_end
= (unsigned long)
734 __va(of_read_ulong(prop
, l
/4));
735 initrd_below_start_ok
= 1;
741 DBG("initrd_start=0x%lx initrd_end=0x%lx\n", initrd_start
, initrd_end
);
744 static inline void early_init_dt_check_for_initrd(unsigned long node
)
747 #endif /* CONFIG_BLK_DEV_INITRD */
749 static int __init
early_init_dt_scan_chosen(unsigned long node
,
750 const char *uname
, int depth
, void *data
)
752 unsigned long *lprop
;
756 DBG("search \"chosen\", depth: %d, uname: %s\n", depth
, uname
);
759 (strcmp(uname
, "chosen") != 0 && strcmp(uname
, "chosen@0") != 0))
763 /* check if iommu is forced on or off */
764 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
766 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
770 /* mem=x on the command line is the preferred mechanism */
771 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
773 memory_limit
= *lprop
;
776 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
778 tce_alloc_start
= *lprop
;
779 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
781 tce_alloc_end
= *lprop
;
785 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
787 crashk_res
.start
= *lprop
;
789 lprop
= (u64
*)of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
791 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
794 early_init_dt_check_for_initrd(node
);
796 /* Retreive command line */
797 p
= of_get_flat_dt_prop(node
, "bootargs", &l
);
798 if (p
!= NULL
&& l
> 0)
799 strlcpy(cmd_line
, p
, min((int)l
, COMMAND_LINE_SIZE
));
801 #ifdef CONFIG_CMDLINE
802 if (p
== NULL
|| l
== 0 || (l
== 1 && (*p
) == 0))
803 strlcpy(cmd_line
, CONFIG_CMDLINE
, COMMAND_LINE_SIZE
);
804 #endif /* CONFIG_CMDLINE */
806 DBG("Command line is: %s\n", cmd_line
);
812 static int __init
early_init_dt_scan_root(unsigned long node
,
813 const char *uname
, int depth
, void *data
)
820 prop
= of_get_flat_dt_prop(node
, "#size-cells", NULL
);
821 dt_root_size_cells
= (prop
== NULL
) ? 1 : *prop
;
822 DBG("dt_root_size_cells = %x\n", dt_root_size_cells
);
824 prop
= of_get_flat_dt_prop(node
, "#address-cells", NULL
);
825 dt_root_addr_cells
= (prop
== NULL
) ? 2 : *prop
;
826 DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells
);
832 static unsigned long __init
dt_mem_next_cell(int s
, cell_t
**cellp
)
837 return of_read_ulong(p
, s
);
840 #ifdef CONFIG_PPC_PSERIES
842 * Interpret the ibm,dynamic-memory property in the
843 * /ibm,dynamic-reconfiguration-memory node.
844 * This contains a list of memory blocks along with NUMA affinity
847 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
851 unsigned long base
, size
, lmb_size
, flags
;
853 ls
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
854 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(cell_t
))
856 lmb_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
858 dm
= (cell_t
*)of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
859 if (dm
== NULL
|| l
< sizeof(cell_t
))
862 n
= *dm
++; /* number of entries */
863 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(cell_t
))
866 for (; n
!= 0; --n
) {
867 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
869 /* skip DRC index, pad, assoc. list index, flags */
871 /* skip this block if the reserved bit is set in flags (0x80)
872 or if the block is not assigned to this partition (0x8) */
873 if ((flags
& 0x80) || !(flags
& 0x8))
877 if (base
>= 0x80000000ul
)
879 if ((base
+ size
) > 0x80000000ul
)
880 size
= 0x80000000ul
- base
;
888 #define early_init_dt_scan_drconf_memory(node) 0
889 #endif /* CONFIG_PPC_PSERIES */
891 static int __init
early_init_dt_scan_memory(unsigned long node
,
892 const char *uname
, int depth
, void *data
)
894 char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
898 /* Look for the ibm,dynamic-reconfiguration-memory node */
900 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
901 return early_init_dt_scan_drconf_memory(node
);
903 /* We are scanning "memory" nodes only */
906 * The longtrail doesn't have a device_type on the
907 * /memory node, so look for the node called /memory@0.
909 if (depth
!= 1 || strcmp(uname
, "memory@0") != 0)
911 } else if (strcmp(type
, "memory") != 0)
914 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "linux,usable-memory", &l
);
916 reg
= (cell_t
*)of_get_flat_dt_prop(node
, "reg", &l
);
920 endp
= reg
+ (l
/ sizeof(cell_t
));
922 DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
923 uname
, l
, reg
[0], reg
[1], reg
[2], reg
[3]);
925 while ((endp
- reg
) >= (dt_root_addr_cells
+ dt_root_size_cells
)) {
926 unsigned long base
, size
;
928 base
= dt_mem_next_cell(dt_root_addr_cells
, ®
);
929 size
= dt_mem_next_cell(dt_root_size_cells
, ®
);
933 DBG(" - %lx , %lx\n", base
, size
);
936 if (base
>= 0x80000000ul
)
938 if ((base
+ size
) > 0x80000000ul
)
939 size
= 0x80000000ul
- base
;
947 static void __init
early_reserve_mem(void)
951 unsigned long self_base
;
952 unsigned long self_size
;
954 reserve_map
= (u64
*)(((unsigned long)initial_boot_params
) +
955 initial_boot_params
->off_mem_rsvmap
);
957 /* before we do anything, lets reserve the dt blob */
958 self_base
= __pa((unsigned long)initial_boot_params
);
959 self_size
= initial_boot_params
->totalsize
;
960 lmb_reserve(self_base
, self_size
);
962 #ifdef CONFIG_BLK_DEV_INITRD
963 /* then reserve the initrd, if any */
964 if (initrd_start
&& (initrd_end
> initrd_start
))
965 lmb_reserve(__pa(initrd_start
), initrd_end
- initrd_start
);
966 #endif /* CONFIG_BLK_DEV_INITRD */
970 * Handle the case where we might be booting from an old kexec
971 * image that setup the mem_rsvmap as pairs of 32-bit values
973 if (*reserve_map
> 0xffffffffull
) {
974 u32 base_32
, size_32
;
975 u32
*reserve_map_32
= (u32
*)reserve_map
;
978 base_32
= *(reserve_map_32
++);
979 size_32
= *(reserve_map_32
++);
982 /* skip if the reservation is for the blob */
983 if (base_32
== self_base
&& size_32
== self_size
)
985 DBG("reserving: %x -> %x\n", base_32
, size_32
);
986 lmb_reserve(base_32
, size_32
);
992 base
= *(reserve_map
++);
993 size
= *(reserve_map
++);
996 DBG("reserving: %llx -> %llx\n", base
, size
);
997 lmb_reserve(base
, size
);
1001 DBG("memory reserved, lmbs :\n");
1006 void __init
early_init_devtree(void *params
)
1008 DBG(" -> early_init_devtree()\n");
1010 /* Setup flat device-tree pointer */
1011 initial_boot_params
= params
;
1013 #ifdef CONFIG_PPC_RTAS
1014 /* Some machines might need RTAS info for debugging, grab it now. */
1015 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
1018 /* Retrieve various informations from the /chosen node of the
1019 * device-tree, including the platform type, initrd location and
1020 * size, TCE reserve, and more ...
1022 of_scan_flat_dt(early_init_dt_scan_chosen
, NULL
);
1024 /* Scan memory nodes and rebuild LMBs */
1026 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
1027 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
1029 /* Save command line for /proc/cmdline and then parse parameters */
1030 strlcpy(boot_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
1031 parse_early_param();
1033 /* Reserve LMB regions used by kernel, initrd, dt, etc... */
1034 lmb_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
1035 reserve_kdump_trampoline();
1036 reserve_crashkernel();
1037 early_reserve_mem();
1039 lmb_enforce_memory_limit(memory_limit
);
1042 DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
1044 /* We may need to relocate the flat tree, do it now.
1045 * FIXME .. and the initrd too? */
1048 DBG("Scanning CPUs ...\n");
1050 /* Retreive CPU related informations from the flat tree
1051 * (altivec support, boot CPU ID, ...)
1053 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
1055 DBG(" <- early_init_devtree()\n");
1060 int of_n_addr_cells(struct device_node
* np
)
1066 ip
= of_get_property(np
, "#address-cells", NULL
);
1069 } while (np
->parent
);
1070 /* No #address-cells property for the root node, default to 1 */
1073 EXPORT_SYMBOL(of_n_addr_cells
);
1075 int of_n_size_cells(struct device_node
* np
)
1081 ip
= of_get_property(np
, "#size-cells", NULL
);
1084 } while (np
->parent
);
1085 /* No #size-cells property for the root node, default to 1 */
1088 EXPORT_SYMBOL(of_n_size_cells
);
1090 /** Checks if the given "compat" string matches one of the strings in
1091 * the device's "compatible" property
1093 int of_device_is_compatible(const struct device_node
*device
,
1099 cp
= of_get_property(device
, "compatible", &cplen
);
1103 if (strncasecmp(cp
, compat
, strlen(compat
)) == 0)
1112 EXPORT_SYMBOL(of_device_is_compatible
);
1116 * Indicates whether the root node has a given value in its
1117 * compatible property.
1119 int machine_is_compatible(const char *compat
)
1121 struct device_node
*root
;
1124 root
= of_find_node_by_path("/");
1126 rc
= of_device_is_compatible(root
, compat
);
1131 EXPORT_SYMBOL(machine_is_compatible
);
1135 * New implementation of the OF "find" APIs, return a refcounted
1136 * object, call of_node_put() when done. The device tree and list
1137 * are protected by a rw_lock.
1139 * Note that property management will need some locking as well,
1140 * this isn't dealt with yet.
1145 * of_find_node_by_name - Find a node by its "name" property
1146 * @from: The node to start searching from or NULL, the node
1147 * you pass will not be searched, only the next one
1148 * will; typically, you pass what the previous call
1149 * returned. of_node_put() will be called on it
1150 * @name: The name string to match against
1152 * Returns a node pointer with refcount incremented, use
1153 * of_node_put() on it when done.
1155 struct device_node
*of_find_node_by_name(struct device_node
*from
,
1158 struct device_node
*np
;
1160 read_lock(&devtree_lock
);
1161 np
= from
? from
->allnext
: allnodes
;
1162 for (; np
!= NULL
; np
= np
->allnext
)
1163 if (np
->name
!= NULL
&& strcasecmp(np
->name
, name
) == 0
1167 read_unlock(&devtree_lock
);
1170 EXPORT_SYMBOL(of_find_node_by_name
);
1173 * of_find_node_by_type - Find a node by its "device_type" property
1174 * @from: The node to start searching from, or NULL to start searching
1175 * the entire device tree. The node you pass will not be
1176 * searched, only the next one will; typically, you pass
1177 * what the previous call returned. of_node_put() will be
1178 * called on from for you.
1179 * @type: The type string to match against
1181 * Returns a node pointer with refcount incremented, use
1182 * of_node_put() on it when done.
1184 struct device_node
*of_find_node_by_type(struct device_node
*from
,
1187 struct device_node
*np
;
1189 read_lock(&devtree_lock
);
1190 np
= from
? from
->allnext
: allnodes
;
1191 for (; np
!= 0; np
= np
->allnext
)
1192 if (np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0
1196 read_unlock(&devtree_lock
);
1199 EXPORT_SYMBOL(of_find_node_by_type
);
1202 * of_find_compatible_node - Find a node based on type and one of the
1203 * tokens in its "compatible" property
1204 * @from: The node to start searching from or NULL, the node
1205 * you pass will not be searched, only the next one
1206 * will; typically, you pass what the previous call
1207 * returned. of_node_put() will be called on it
1208 * @type: The type string to match "device_type" or NULL to ignore
1209 * @compatible: The string to match to one of the tokens in the device
1210 * "compatible" list.
1212 * Returns a node pointer with refcount incremented, use
1213 * of_node_put() on it when done.
1215 struct device_node
*of_find_compatible_node(struct device_node
*from
,
1216 const char *type
, const char *compatible
)
1218 struct device_node
*np
;
1220 read_lock(&devtree_lock
);
1221 np
= from
? from
->allnext
: allnodes
;
1222 for (; np
!= 0; np
= np
->allnext
) {
1224 && !(np
->type
!= 0 && strcasecmp(np
->type
, type
) == 0))
1226 if (of_device_is_compatible(np
, compatible
) && of_node_get(np
))
1230 read_unlock(&devtree_lock
);
1233 EXPORT_SYMBOL(of_find_compatible_node
);
1236 * of_find_node_by_path - Find a node matching a full OF path
1237 * @path: The full path to match
1239 * Returns a node pointer with refcount incremented, use
1240 * of_node_put() on it when done.
1242 struct device_node
*of_find_node_by_path(const char *path
)
1244 struct device_node
*np
= allnodes
;
1246 read_lock(&devtree_lock
);
1247 for (; np
!= 0; np
= np
->allnext
) {
1248 if (np
->full_name
!= 0 && strcasecmp(np
->full_name
, path
) == 0
1252 read_unlock(&devtree_lock
);
1255 EXPORT_SYMBOL(of_find_node_by_path
);
1258 * of_find_node_by_phandle - Find a node given a phandle
1259 * @handle: phandle of the node to find
1261 * Returns a node pointer with refcount incremented, use
1262 * of_node_put() on it when done.
1264 struct device_node
*of_find_node_by_phandle(phandle handle
)
1266 struct device_node
*np
;
1268 read_lock(&devtree_lock
);
1269 for (np
= allnodes
; np
!= 0; np
= np
->allnext
)
1270 if (np
->linux_phandle
== handle
)
1273 read_unlock(&devtree_lock
);
1276 EXPORT_SYMBOL(of_find_node_by_phandle
);
1279 * of_find_all_nodes - Get next node in global list
1280 * @prev: Previous node or NULL to start iteration
1281 * of_node_put() will be called on it
1283 * Returns a node pointer with refcount incremented, use
1284 * of_node_put() on it when done.
1286 struct device_node
*of_find_all_nodes(struct device_node
*prev
)
1288 struct device_node
*np
;
1290 read_lock(&devtree_lock
);
1291 np
= prev
? prev
->allnext
: allnodes
;
1292 for (; np
!= 0; np
= np
->allnext
)
1293 if (of_node_get(np
))
1296 read_unlock(&devtree_lock
);
1299 EXPORT_SYMBOL(of_find_all_nodes
);
1302 * of_get_parent - Get a node's parent if any
1303 * @node: Node to get parent
1305 * Returns a node pointer with refcount incremented, use
1306 * of_node_put() on it when done.
1308 struct device_node
*of_get_parent(const struct device_node
*node
)
1310 struct device_node
*np
;
1315 read_lock(&devtree_lock
);
1316 np
= of_node_get(node
->parent
);
1317 read_unlock(&devtree_lock
);
1320 EXPORT_SYMBOL(of_get_parent
);
1323 * of_get_next_child - Iterate a node childs
1324 * @node: parent node
1325 * @prev: previous child of the parent node, or NULL to get first
1327 * Returns a node pointer with refcount incremented, use
1328 * of_node_put() on it when done.
1330 struct device_node
*of_get_next_child(const struct device_node
*node
,
1331 struct device_node
*prev
)
1333 struct device_node
*next
;
1335 read_lock(&devtree_lock
);
1336 next
= prev
? prev
->sibling
: node
->child
;
1337 for (; next
!= 0; next
= next
->sibling
)
1338 if (of_node_get(next
))
1341 read_unlock(&devtree_lock
);
1344 EXPORT_SYMBOL(of_get_next_child
);
1347 * of_node_get - Increment refcount of a node
1348 * @node: Node to inc refcount, NULL is supported to
1349 * simplify writing of callers
1353 struct device_node
*of_node_get(struct device_node
*node
)
1356 kref_get(&node
->kref
);
1359 EXPORT_SYMBOL(of_node_get
);
1361 static inline struct device_node
* kref_to_device_node(struct kref
*kref
)
1363 return container_of(kref
, struct device_node
, kref
);
1367 * of_node_release - release a dynamically allocated node
1368 * @kref: kref element of the node to be released
1370 * In of_node_put() this function is passed to kref_put()
1371 * as the destructor.
1373 static void of_node_release(struct kref
*kref
)
1375 struct device_node
*node
= kref_to_device_node(kref
);
1376 struct property
*prop
= node
->properties
;
1378 if (!OF_IS_DYNAMIC(node
))
1381 struct property
*next
= prop
->next
;
1388 prop
= node
->deadprops
;
1389 node
->deadprops
= NULL
;
1392 kfree(node
->full_name
);
1398 * of_node_put - Decrement refcount of a node
1399 * @node: Node to dec refcount, NULL is supported to
1400 * simplify writing of callers
1403 void of_node_put(struct device_node
*node
)
1406 kref_put(&node
->kref
, of_node_release
);
1408 EXPORT_SYMBOL(of_node_put
);
1411 * Plug a device node into the tree and global list.
1413 void of_attach_node(struct device_node
*np
)
1415 write_lock(&devtree_lock
);
1416 np
->sibling
= np
->parent
->child
;
1417 np
->allnext
= allnodes
;
1418 np
->parent
->child
= np
;
1420 write_unlock(&devtree_lock
);
1424 * "Unplug" a node from the device tree. The caller must hold
1425 * a reference to the node. The memory associated with the node
1426 * is not freed until its refcount goes to zero.
1428 void of_detach_node(const struct device_node
*np
)
1430 struct device_node
*parent
;
1432 write_lock(&devtree_lock
);
1434 parent
= np
->parent
;
1437 allnodes
= np
->allnext
;
1439 struct device_node
*prev
;
1440 for (prev
= allnodes
;
1441 prev
->allnext
!= np
;
1442 prev
= prev
->allnext
)
1444 prev
->allnext
= np
->allnext
;
1447 if (parent
->child
== np
)
1448 parent
->child
= np
->sibling
;
1450 struct device_node
*prevsib
;
1451 for (prevsib
= np
->parent
->child
;
1452 prevsib
->sibling
!= np
;
1453 prevsib
= prevsib
->sibling
)
1455 prevsib
->sibling
= np
->sibling
;
1458 write_unlock(&devtree_lock
);
1461 #ifdef CONFIG_PPC_PSERIES
1463 * Fix up the uninitialized fields in a new device node:
1464 * name, type and pci-specific fields
1467 static int of_finish_dynamic_node(struct device_node
*node
)
1469 struct device_node
*parent
= of_get_parent(node
);
1471 const phandle
*ibm_phandle
;
1473 node
->name
= of_get_property(node
, "name", NULL
);
1474 node
->type
= of_get_property(node
, "device_type", NULL
);
1477 node
->name
= "<NULL>";
1479 node
->type
= "<NULL>";
1486 /* We don't support that function on PowerMac, at least
1489 if (machine_is(powermac
))
1492 /* fix up new node's linux_phandle field */
1493 if ((ibm_phandle
= of_get_property(node
, "ibm,phandle", NULL
)))
1494 node
->linux_phandle
= *ibm_phandle
;
1497 of_node_put(parent
);
1501 static int prom_reconfig_notifier(struct notifier_block
*nb
,
1502 unsigned long action
, void *node
)
1507 case PSERIES_RECONFIG_ADD
:
1508 err
= of_finish_dynamic_node(node
);
1510 printk(KERN_ERR
"finish_node returned %d\n", err
);
1521 static struct notifier_block prom_reconfig_nb
= {
1522 .notifier_call
= prom_reconfig_notifier
,
1523 .priority
= 10, /* This one needs to run first */
1526 static int __init
prom_reconfig_setup(void)
1528 return pSeries_reconfig_notifier_register(&prom_reconfig_nb
);
1530 __initcall(prom_reconfig_setup
);
1533 struct property
*of_find_property(const struct device_node
*np
,
1537 struct property
*pp
;
1539 read_lock(&devtree_lock
);
1540 for (pp
= np
->properties
; pp
!= 0; pp
= pp
->next
)
1541 if (strcmp(pp
->name
, name
) == 0) {
1546 read_unlock(&devtree_lock
);
1550 EXPORT_SYMBOL(of_find_property
);
1553 * Find a property with a given name for a given node
1554 * and return the value.
1556 const void *of_get_property(const struct device_node
*np
, const char *name
,
1559 struct property
*pp
= of_find_property(np
,name
,lenp
);
1560 return pp
? pp
->value
: NULL
;
1562 EXPORT_SYMBOL(of_get_property
);
1565 * Add a property to a node
1567 int prom_add_property(struct device_node
* np
, struct property
* prop
)
1569 struct property
**next
;
1572 write_lock(&devtree_lock
);
1573 next
= &np
->properties
;
1575 if (strcmp(prop
->name
, (*next
)->name
) == 0) {
1576 /* duplicate ! don't insert it */
1577 write_unlock(&devtree_lock
);
1580 next
= &(*next
)->next
;
1583 write_unlock(&devtree_lock
);
1585 #ifdef CONFIG_PROC_DEVICETREE
1586 /* try to add to proc as well if it was initialized */
1588 proc_device_tree_add_prop(np
->pde
, prop
);
1589 #endif /* CONFIG_PROC_DEVICETREE */
1595 * Remove a property from a node. Note that we don't actually
1596 * remove it, since we have given out who-knows-how-many pointers
1597 * to the data using get-property. Instead we just move the property
1598 * to the "dead properties" list, so it won't be found any more.
1600 int prom_remove_property(struct device_node
*np
, struct property
*prop
)
1602 struct property
**next
;
1605 write_lock(&devtree_lock
);
1606 next
= &np
->properties
;
1608 if (*next
== prop
) {
1609 /* found the node */
1611 prop
->next
= np
->deadprops
;
1612 np
->deadprops
= prop
;
1616 next
= &(*next
)->next
;
1618 write_unlock(&devtree_lock
);
1623 #ifdef CONFIG_PROC_DEVICETREE
1624 /* try to remove the proc node as well */
1626 proc_device_tree_remove_prop(np
->pde
, prop
);
1627 #endif /* CONFIG_PROC_DEVICETREE */
1633 * Update a property in a node. Note that we don't actually
1634 * remove it, since we have given out who-knows-how-many pointers
1635 * to the data using get-property. Instead we just move the property
1636 * to the "dead properties" list, and add the new property to the
1639 int prom_update_property(struct device_node
*np
,
1640 struct property
*newprop
,
1641 struct property
*oldprop
)
1643 struct property
**next
;
1646 write_lock(&devtree_lock
);
1647 next
= &np
->properties
;
1649 if (*next
== oldprop
) {
1650 /* found the node */
1651 newprop
->next
= oldprop
->next
;
1653 oldprop
->next
= np
->deadprops
;
1654 np
->deadprops
= oldprop
;
1658 next
= &(*next
)->next
;
1660 write_unlock(&devtree_lock
);
1665 #ifdef CONFIG_PROC_DEVICETREE
1666 /* try to add to proc as well if it was initialized */
1668 proc_device_tree_update_prop(np
->pde
, newprop
, oldprop
);
1669 #endif /* CONFIG_PROC_DEVICETREE */
1675 /* Find the device node for a given logical cpu number, also returns the cpu
1676 * local thread number (index in ibm,interrupt-server#s) if relevant and
1677 * asked for (non NULL)
1679 struct device_node
*of_get_cpu_node(int cpu
, unsigned int *thread
)
1682 struct device_node
*np
;
1684 hardid
= get_hard_smp_processor_id(cpu
);
1686 for_each_node_by_type(np
, "cpu") {
1688 unsigned int plen
, t
;
1690 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
1691 * fallback to "reg" property and assume no threads
1693 intserv
= of_get_property(np
, "ibm,ppc-interrupt-server#s",
1695 if (intserv
== NULL
) {
1696 const u32
*reg
= of_get_property(np
, "reg", NULL
);
1699 if (*reg
== hardid
) {
1705 plen
/= sizeof(u32
);
1706 for (t
= 0; t
< plen
; t
++) {
1707 if (hardid
== intserv
[t
]) {
1717 EXPORT_SYMBOL(of_get_cpu_node
);
1720 static struct debugfs_blob_wrapper flat_dt_blob
;
1722 static int __init
export_flat_device_tree(void)
1726 d
= debugfs_create_dir("powerpc", NULL
);
1730 flat_dt_blob
.data
= initial_boot_params
;
1731 flat_dt_blob
.size
= initial_boot_params
->totalsize
;
1733 d
= debugfs_create_blob("flat-device-tree", S_IFREG
| S_IRUSR
,
1740 __initcall(export_flat_device_tree
);